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84 L4400 User’s Guide
3 Operating and Programming
• You can configure the list of channels for 4-wire external scanning. When
enabled, the instrument automatically pairs channel n in Bank 1 with
channel n+20 in Bank 2 to provide the source and sense connections. For
example, make the source connections to the HI and LO terminals on
channel 2 in Bank 1 and the sense connections to the HI and LO terminals
on channel 22 (or 37) in Bank 2.
To configure the instrument for 4-wire external scanning, send the following
command.
ROUTe:CHANnel:FWIRe {OFF|ON}, (@<
ch_list
>)
The following program segment configures a separate DMM and the L4421A
for one pass through a scan list of 10 channels (Figure 3-14).
The L4400 Product Reference CD-ROM (p/n 34989-13601) included with the
L4400 instruments contains complete examples (VISA, VISA-COM, IVI-COM)
of scanning L4421A channels using a separate DMM. The example is in the
folder “Mux_L4421A.”
Alarm Limits
Usage:
• L4450A 64-Bit Digital I/O (digital input, counter channels only)
• L4452A Multifunction Module (digital input, totalizer channels only)
You can configure the instrument to generate an alarm when a specific
bit pattern or bit pattern change is detected on a digital input channel
or when a specific count is reached on a totalizer channel of the L4450A and
L4452A. These channels do not have to be part of the scan list to generate an
alarm. Alarms are evaluated continuously as soon as you enable them.
There are two alarm paths that can be configured to alert you when specific
alarm conditions are encountered during a scan. You can assign multiple
channels to either of the two available alarms (ALARm1, ALARm2).
Alarm data can be stored in one of two locations depending on whether a
scan is running when the alarm occurs.
CONF:RES AUTO, DEF
TRIG:SOUR EXT
TRIG:COUN 10
INIT
ROUT:SCAN (@1001:1010)
ROUT:CHAN:ADV:SOUR EXT
INIT
Configure DMM function (resistance)
Set DMM trigger source
Set DMM trigger count
Put DMM in wait-for-trigger state
Set L4421A scan list
Set L4421A channel advance source
Initiate the scan (close first channel)